A medical ultra-flexible, lightweight, high-power radio frequency cable and a production method thereof

Abstract

The present invention relates to the field of radio frequency cable technology, and in particular to an ultra-flexible, lightweight, high-power radio frequency cable for medical use and a production method thereof, comprising: the radio frequency cable is composed of a cable core, an inner protective layer, a shielding layer, and an outer protective layer from inside to outside; the cable core comprises a plurality of twisted conductors; the plurality of twisted conductors are connected by twisting; the inner protective layer is coated on the outer periphery of the cable core to isolate the current and reduce the torsional force of the cable core; the shielding layer is used to eliminate signal mutual interference, and comprises a first shielding layer and a second shielding layer, the first shielding layer is coated on the outer periphery of the inner protective layer, and the second shielding layer is coated on the outer periphery of the first shielding layer; the outer protective layer is coated on the outer periphery of the second shielding layer to protect the internal overall structure; the outer protective layer is made of a flexible material. The present invention can improve the bending performance and power transmission performance, and can reduce the weight of the radio frequency cable.

Description

Technical Field

[0001] The present invention relates to the technical field of radio frequency cables, and in particular to an ultra-flexible, lightweight, high-power radio frequency cable for medical use and a production method thereof. Background Art

[0002] Radiofrequency ablation is a commonly used treatment option in current medical treatment. Radiofrequency cables are used to transmit radiofrequency energy to the lesion site to kill diseased cells. Radiofrequency cables are required to have low loss, high shielding, softness, light weight, low heat generation during operation, and low cost. The current manufacturing process uses corrugation to change the bending properties of the cable, and uses welding, heating and other methods to connect different levels. It is impossible to simultaneously guarantee the softness, bending performance, power usage, shielding and other characteristics of the radiofrequency cable.

[0003] Chinese patent publication number CN105551578A discloses a low-attenuation, high-power, high-temperature coaxial radio frequency cable and its preparation process, comprising an inner conductor layer, an insulating layer, a shielding layer and a sheath layer, wherein the inner conductor layer is provided with an insulating layer outside, the insulating layer is provided with a shielding layer outside, and the shielding layer is provided with a sheath layer outside. The inner conductor layer is made of silver-plated copper wire, the insulating layer is made of low-density polytetrafluoroethylene, the shielding layer is made of corrugated copper tube, and the sheath layer is made of polytetrafluoroethylene.

[0004] It can be seen that the above invention has the following problems: the insulating layer uses low-density polytetrafluoroethylene and the shielding layer uses corrugated copper tube, which will affect the power transmission of the cable and it is difficult to ensure the bending performance and lightweight requirements of the RF cable. Summary of the invention

[0005] To this end, the present invention provides an ultra-flexible, lightweight, high-power radio frequency cable for medical use and a production method thereof, so as to overcome the problems in the prior art that power transmission is affected and it is difficult to ensure the bending performance and lightweight requirements of the radio frequency cable.

[0006] To achieve the above objectives, on the one hand, the present invention provides an ultra-flexible, lightweight, high-power radio frequency cable for medical use, comprising:

[0007] The radio frequency cable is composed of a cable core, an inner protective layer, a shielding layer and an outer protective layer from inside to outside;

[0008] The cable core includes a plurality of twisted conductors; the plurality of twisted conductors are connected by twisting;

[0009] The inner protective layer is wrapped around the outer periphery of the cable core to isolate the current and reduce the torsional force of the cable core; the inner protective layer is made of a flexible material;

[0010] The shielding layer is used to eliminate signal mutual interference, and includes a first shielding layer and a second shielding layer, wherein the first shielding layer is wrapped around the outer periphery of the inner protective layer, and the second shielding layer is wrapped around the outer periphery of the first shielding layer; wherein the first shielding layer is wrapped around the inner protective layer, and the wrapping bandwidth of the first shielding layer is determined by the minimum bending radius of the cable;

[0011] The outer protective layer is coated on the outer periphery of the second shielding layer to protect the internal overall structure; the outer protective layer is made of flexible material.

[0012] Furthermore, the first shielding layer is a copper-plastic composite tape, the second shielding layer is a tinned copper wire braided structure, the inner protective layer is an extruded foamed PTFE medium, and the outer protective layer is an extruded foamed PTFE medium.

[0013] On the other hand, the present invention also provides a method for producing a radio frequency cable, comprising:

[0014] Step S1, obtaining a twisted cable core, coating the outer periphery of the cable core with a first coating material to obtain an inner protective layer, and obtaining the thickness of the inner protective layer, the overall diameter of the cable core and the inner protective layer, the minimum bending radius of the cable, and the maximum bending radius of the cable; the first coating material is an extruded foamed PTFE medium;

[0015] Step S2, determining the bandwidth of the second coating material according to the thickness of the inner protective layer, the overall diameter of the cable core and the inner protective layer, and the minimum bending radius of the cable, and using the corresponding bandwidth to wrap the second coating material around the outer periphery of the inner protective layer to obtain a first shielding layer; wherein the second coating material is a copper-plastic composite tape;

[0016] Step S3, bending the cable after the second coating material covers the inner protective layer for a preset number of times to obtain a radial slip amount of the second coating material, and determining a fixing method of the first shielding layer according to the radial slip amount, including continuous fixing and intermittent fixing;

[0017] Step S4, determining the diameter of the third coating material according to the outer diameter of the first shielding layer, the minimum bending radius of the cable and the standard bending frequency, and weaving and coating a plurality of the third coating materials on the outer periphery of the first shielding layer at a first braiding angle to obtain the second shielding layer; wherein the third coating material is tinned copper wire;

[0018] Step S5, obtaining the maximum bending deformation of the second shielding layer, and determining the thickness of the outer protective layer according to the maximum bending deformation;

[0019] Step S6, preparing the outer protective layer based on the thickness of the outer protective layer, and coating the outer protective layer on the outer periphery of the second shielding layer to complete the preparation of the radio frequency cable.

[0020] Further, in the step S2, determining the bandwidth of the second coating material includes:

[0021] Step S21, determining the thickness of the second coating material according to the thickness of the inner protective layer and the overall diameter of the cable core and the inner protective layer;

[0022] Step S22: determining the bandwidth of the second coating material according to the thickness of the second coating material and the minimum bending radius of the cable.

[0023] Furthermore, in the step S3, the preset number of times is determined according to the minimum bending radius and the maximum bending radius of the cable.

[0024] Further, in the step S3, a fixing method of the first shielding layer is determined according to a relationship between the radial slip amount and a preset slip amount threshold.

[0025] Further, in step S3, if the radial slip is less than a preset slip threshold, the first shielding layer is fixed in an intermittent manner; if the radial slip is greater than or equal to the preset slip threshold, the first shielding layer is fixed in a continuous manner.

[0026] Furthermore, in step S4, determining the diameter of the third coating material includes:

[0027] Step S41, determining a first curvature according to an outer diameter of the first shielding layer and a minimum bending radius of the cable;

[0028] Step S42: determining the diameter of the third coating material according to the first curvature and the standard bending frequency.

[0029] Further, in the step S4, the first braiding angle is determined according to the thickness of the inner protective layer and the thickness of the first shielding layer.

[0030] Furthermore, in the step S5, the maximum bending deformation amount and the standard bending deformation amount of the second shielding layer are compared, and the thickness of the outer protective layer is determined according to the comparison result.

[0031] Compared with the prior art, the beneficial effects of the present invention are that the cable core of the present invention is connected by a plurality of twisted conductors, which can increase the bending performance of the radio frequency cable; an inner protective layer is provided for insulation, which can isolate the current and reduce the torsional force of the cable core, and the inner protective layer is made of a flexible material, which can reduce the weight of the radio frequency cable while maintaining its softness; a shielding layer is provided, which can eliminate signal mutual interference, and the shielding layer is provided as a double-layer shielding, which can improve the shielding performance of the radio frequency cable, and the first shielding layer is wrapped by winding to form an effective electromagnetic shielding layer, which reduces the influence of external electromagnetic interference on the internal signal, and can increase the mechanical strength and bending performance of the radio frequency cable; the second shielding layer is wrapped by braiding, which can effectively reduce the electromagnetic interference of the radio frequency cable to the outside world when it is used, which is beneficial to the transmission of high-frequency signals. In addition, the braiding wrapping has good flexibility, and can also reduce the attenuation of the signal during the transmission process, thereby ensuring the signal transmission quality; an outer protective layer is provided, which can protect the cable core, the inner protective layer and the shielding layer inside the radio frequency cable, protect the structural integrity of the radio frequency cable, increase the service life and ensure the performance of the radio frequency cable, and the outer protective layer is made of a flexible material, which can reduce the weight of the cable while increasing the bending performance of the radio frequency cable.

[0032] Furthermore, the first shielding layer of the present invention is a copper-plastic composite tape, which has a good shielding effect, and can improve the waterproof performance and mechanical strength of the RF cable, and reduce the signal attenuation of the RF cable; the second shielding layer is a tinned copper wire braided structure, which can extend the service life of the cable and improve the mechanical strength and bending performance of the shielding layer; the inner protective layer and the outer protective layer are extruded foamed PTFE media, which can reduce the impact of the medium on power transmission and the weight of the RF cable, and increase the flexibility of the RF cable.

[0033] Furthermore, the present invention can ensure appropriate wrapping and shielding effects by determining the bandwidth of the second coating material according to the thickness of the inner protective layer, the overall diameter of the cable core and the inner protective layer, and the minimum bending radius of the cable; determine the fixing method of the first shielding layer according to the radial slip amount of the second coating material, which can improve production efficiency and the shielding effect of the shielding layer; determine the diameter of the third coating material according to the outer diameter of the first shielding layer, the minimum bending radius of the cable and the standard bending frequency, which can improve the shielding effect and bending performance of the second shielding layer; weave a plurality of third coating materials at a first braiding angle around the outer periphery of the first shielding layer, which can improve the mechanical strength and shielding effect of the second shielding layer; determine the thickness of the outer protective layer according to the maximum bending deformation, which can balance the flexibility and weight of the outer protective layer and extend the service life of the radio frequency cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the structure of the ultra-flexible, lightweight, high-power radio frequency cable for medical use of the present invention;

[0035] Figure 2 It is a flow chart of the radio frequency cable production method of the present invention;

[0036] Figure 3 A flow chart of the steps of determining the bandwidth of the second coating material according to an embodiment of the present invention;

[0037] Figure 4 A flow chart of the steps of determining the diameter of the third coating material according to an embodiment of the present invention;

[0038] In the figure: 1, cable core; 2, inner protective layer; 3, shielding layer; 31, first shielding layer; 32, second shielding layer; 4, outer protective layer. DETAILED DESCRIPTION

[0039] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0040] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0041] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0042] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] See also Figure 1 As shown, it is a schematic diagram of the structure of the ultra-flexible, lightweight, high-power radio frequency cable for medical use of the present invention; the present invention provides an ultra-flexible, lightweight, high-power radio frequency cable for medical use, comprising:

[0044] The radio frequency cable is composed of a cable core 1, an inner protective layer 2, a shielding layer 3 and an outer protective layer 4 from inside to outside;

[0045] The cable core 1 comprises a plurality of twisted conductors; the plurality of twisted conductors are connected by twisting;

[0046] In practice, in order to improve the bending performance and flexibility of the cable, the cable core will adopt a plurality of single-filament twisted conductors twisted together. Generally, the twisted conductor can be copper, aluminum, silver-plated copper wire, tin-plated copper wire, etc. Preferably, the twisted conductor is silver-plated copper wire. The electrical conductivity of silver is higher than that of copper, and it has high corrosion resistance, and is suitable for use in high-power radio frequency cables.

[0047] Specifically, the number of twisted monofilament twisted conductors will affect the flexibility and performance of the cable. The actual implementer can set the number of twisted conductors according to the actual situation or based on the historical data of RF cables that have passed the qualification test. Preferably, the number of monofilament twisted conductors is 15 to 20.

[0048] The inner protective layer 2 is wrapped around the outer periphery of the cable core to isolate the current and reduce the torsional force of the cable core; the inner protective layer is made of a flexible material;

[0049] The shielding layer 3 is used to eliminate signal mutual interference, and includes a first shielding layer 31 and a second shielding layer 32. The first shielding layer 31 is coated on the outer periphery of the inner protective layer 2, and the second shielding layer 32 is coated on the outer periphery of the first shielding layer 31; wherein the first shielding layer 31 is wrapped around the inner protective layer 2, and the wrapping bandwidth of the first shielding layer 31 is determined by the minimum bending radius of the cable;

[0050] The outer protective layer 4 is coated on the outer periphery of the second shielding layer 32 to protect the internal overall structure; the outer protective layer 4 is made of flexible material.

[0051] The cable core of the present invention is connected by a plurality of twisted conductors, which can increase the bending performance of the radio frequency cable; an inner protective layer is provided for insulation, which can isolate the current and reduce the torsional force of the cable core, and the inner protective layer is made of a flexible material, which can reduce the weight of the radio frequency cable while maintaining its softness; a shielding layer is provided, which can eliminate signal mutual interference, and the shielding layer is provided with a double-layer shielding, which can improve the shielding performance of the radio frequency cable, and the first shielding layer is wrapped by winding to form an effective electromagnetic shielding layer, which reduces the influence of external electromagnetic interference on the internal signal and can increase the mechanical strength and bending performance of the radio frequency cable; the second shielding layer is wrapped by weaving, which can effectively reduce the electromagnetic interference of the radio frequency cable to the outside world when it is used, which is beneficial to the transmission of high-frequency signals. In addition, the weaving wrapping has good flexibility, and can also reduce the attenuation of the signal during the transmission process, thereby ensuring the signal transmission quality; an outer protective layer is provided, which can protect the cable core, the inner protective layer and the shielding layer inside the radio frequency cable, protect the structural integrity of the radio frequency cable, increase the service life and ensure the performance of the radio frequency cable, and the outer protective layer is made of a flexible material, which can reduce the weight of the cable and increase the bending performance of the radio frequency cable.

[0052] Specifically, the first shielding layer is a copper-plastic composite tape, the second shielding layer is a tinned copper wire braided structure, the inner protective layer is an extruded foamed PTFE medium, and the outer protective layer is an extruded foamed PTFE medium.

[0053] In practice, those skilled in the art know that the copper-plastic composite strip is a prior art in which copper and plastic materials are composited together through a specific process, and will not be described in detail herein.

[0054] Specifically, an extruded foamed PTFE medium is used, which contains a large number of bubble structures inside the material, so that it has a lower density and dielectric constant, and can reduce loss.

[0055] The first shielding layer of the present invention is a copper-plastic composite tape, which has a good shielding effect, can improve the waterproof performance and mechanical strength of the radio frequency cable, and reduce the signal attenuation of the radio frequency cable; the second shielding layer is a tinned copper wire braided structure, which can extend the service life of the cable and improve the mechanical strength and bending performance of the shielding layer; the inner protective layer and the outer protective layer are extruded foamed PTFE media, which can reduce the influence of the medium on power transmission and the weight of the radio frequency cable, and increase the flexibility of the radio frequency cable.

[0056] See also Figure 2 As shown, it is a flow chart of the radio frequency cable production method of the present invention; the present invention also provides a radio frequency cable production method, comprising:

[0057] Step S1, obtaining a twisted cable core, coating the outer periphery of the cable core with a first coating material to obtain an inner protective layer, and obtaining the thickness of the inner protective layer, the overall diameter of the cable core and the inner protective layer, the minimum bending radius of the cable, and the maximum bending radius of the cable; the first coating material is an extruded foamed PTFE medium;

[0058] In implementation, the bending radius of several cables can be obtained by bending the cable covered with the inner protective layer for a preset number of times, and the minimum bending radius and the maximum bending radius of the cable can be determined.

[0059] In actual application, the actual implementer can set the preset number of bending times according to the ratio of the cable core length to the standard length; wherein, the standard length is generally set to 0.5 cm to 3 cm. If it is not an integer, it is rounded off.

[0060] Step S2, determining the bandwidth of the second coating material according to the thickness of the inner protective layer, the overall diameter of the cable core and the inner protective layer, and the minimum bending radius of the cable, and using the corresponding bandwidth to wrap the second coating material around the outer periphery of the inner protective layer to obtain a first shielding layer; wherein the second coating material is a copper-plastic composite tape;

[0061] See also Figure 3 As shown, it is a flowchart of the steps of determining the bandwidth of the second coating material according to an embodiment of the present invention; specifically, in step S2, determining the bandwidth of the second coating material includes:

[0062] Step S21, determining the thickness of the second coating material according to the thickness of the inner protective layer and the overall diameter of the cable core and the inner protective layer;

[0063] In implementation, the first intermediate value can be determined according to the ratio of the thickness of the inner protective layer to the overall diameter of the cable core and the inner protective layer, the second intermediate value can be determined according to the product of the first intermediate value and the first coefficient, and the thickness of the second coating material can be determined according to the product of the second intermediate value and the thickness of the inner protective layer.

[0064] Specifically, the first coefficient is related to the material of the second coating material. The actual implementer can set the first coefficient based on the expert system according to the actual situation or based on the RF cables that have passed the qualification test in the historical data. Preferably, the value range of the first coefficient is set to 0.1 to 0.4.

[0065] Step S22: determining the bandwidth of the second coating material according to the thickness of the second coating material and the minimum bending radius of the cable.

[0066] In implementation, the bandwidth of the second coating material may be determined according to a ratio of a minimum bending radius of the cable to a thickness of the second coating material.

[0067] Step S3, bending the cable after the second coating material covers the inner protective layer for a preset number of times to obtain a radial slip amount of the second coating material, and determining a fixing method of the first shielding layer according to the radial slip amount, including continuous fixing and intermittent fixing;

[0068] Specifically, in step S3, the preset number of times is determined according to the minimum bending radius and the maximum bending radius of the cable.

[0069] In implementation, the preset number of times can be determined according to the ratio of the maximum bending radius of the cable to the minimum bending radius of the cable. If the ratio of the maximum bending radius of the cable to the minimum bending radius of the cable is not an integer, it is rounded up.

[0070] Specifically, in the step S3, the fixing method of the first shielding layer is determined according to the relationship between the radial slip amount and a preset slip amount threshold.

[0071] Specifically, in step S3, if the radial slip is less than a preset slip threshold, the first shielding layer is fixed in an intermittent manner; if the radial slip is greater than or equal to the preset slip threshold, the first shielding layer is fixed in a continuous manner.

[0072] In implementation, the actual implementer may set the preset slip threshold value according to the actual situation or based on the average value of radial slip determined after the cables that have passed the qualification inspection are bent a preset number of times in historical data.

[0073] Specifically, the continuous or intermittent fixing method of the first shielding layer can be heat treatment or glue coating. Those skilled in the art know that any method in the prior art that can fix the first shielding layer on the inner protective layer falls within the protection scope of the present invention and will not be repeated here.

[0074] Step S4, determining the diameter of the third coating material according to the outer diameter of the first shielding layer, the minimum bending radius of the cable and the standard bending frequency, and weaving and coating a plurality of the third coating materials on the outer periphery of the first shielding layer at a first braiding angle to obtain the second shielding layer; wherein the third coating material is tinned copper wire;

[0075] See also Figure 4 As shown, it is a flowchart of the steps of determining the diameter of the third coating material according to an embodiment of the present invention; specifically, in the step S4, determining the diameter of the third coating material includes:

[0076] Step S41, determining a first curvature according to an outer diameter of the first shielding layer and a minimum bending radius of the cable;

[0077] In implementation, the third intermediate value can be determined according to the square of the minimum bending radius of the cable, the fourth intermediate value can be determined according to the square of half the outer diameter of the first shielding layer, and the first curvature can be determined according to the ratio of the third intermediate value to the fourth intermediate value.

[0078] Step S42: determining the diameter of the third coating material according to the first curvature and the standard bending frequency.

[0079] In an implementation, the diameter of the third cladding material may be determined according to the product of the first curvature and the standard bending frequency.

[0080] Specifically, the actual implementer may set the standard bending frequency according to the actual situation or based on the average value of the bending frequencies of multiple bending experiments. Preferably, the value range of the standard bending frequency is set to 20 Hz to 50 Hz.

[0081] Specifically, in the step S4, the first braiding angle is determined according to the thickness of the inner protective layer and the thickness of the first shielding layer.

[0082] In implementation, the fifth intermediate value may be determined according to a ratio of a thickness of the inner protective layer to a thickness of the first shielding layer, and the first braiding angle may be determined according to an inverse tangent of the fifth intermediate value.

[0083] Step S5, obtaining the maximum bending deformation of the second shielding layer, and determining the thickness of the outer protective layer according to the maximum bending deformation;

[0084] Specifically, in step S5, the maximum bending deformation amount and the standard bending deformation amount of the second shielding layer are compared, and the thickness of the outer protective layer is determined according to the comparison result.

[0085] In implementation, the sixth intermediate value can be determined based on the ratio of the maximum bending deformation of the second shielding layer to the standard bending deformation, the seventh intermediate value can be determined based on the product of the sixth intermediate value and the second coefficient, and the thickness of the outer protective layer can be determined based on the product of the seventh intermediate value and the thickness of the inner protective layer.

[0086] Specifically, the second coefficient is related to the material of the second shielding layer. Preferably, the value range of the second coefficient is set to 0.6-0.8; the actual implementer can set the standard bending deformation according to the actual situation based on the average of the maximum bending deformation of the second shielding layer of the RF cable that has passed the qualification test in historical data. Preferably, the value range of the standard bending deformation is set to 2mm-5mm.

[0087] Step S6, preparing the outer protective layer based on the thickness of the outer protective layer, and coating the outer protective layer on the outer periphery of the second shielding layer to complete the preparation of the radio frequency cable.

[0088] The present invention can ensure appropriate wrapping and shielding effects by determining the bandwidth of the second coating material according to the thickness of the inner protective layer, the overall diameter of the cable core and the inner protective layer, and the minimum bending radius of the cable; determine the fixing method of the first shielding layer according to the radial slip amount of the second coating material, which can improve production efficiency and improve the shielding effect of the shielding layer; determine the diameter of the third coating material according to the outer diameter of the first shielding layer, the minimum bending radius of the cable and the standard bending frequency, which can improve the shielding effect and bending performance of the second shielding layer; weave a plurality of third coating materials at a first braiding angle around the outer periphery of the first shielding layer, which can improve the mechanical strength and shielding effect of the second shielding layer; determine the thickness of the outer protective layer according to the maximum bending deformation, which can balance the flexibility and weight of the outer protective layer and extend the service life of the radio frequency cable.

[0089] Example

[0090] In this embodiment, an ultra-flexible, lightweight, high-power radio frequency cable for medical use produced by the production method of the present invention is provided. The product weight is as light as 47 g / m. The performance comparison between the radio frequency cable of the present invention and a common radio frequency cable (weight 52 g / m) is shown in Table 1. The performance comparison data of the radio frequency cable of the present invention and the common radio frequency cable after bending for different numbers of times are shown in Tables 2, 3 and 4.

[0091] Table 1 Performance comparison between the radio frequency cable of the present invention and common radio frequency cables

[0092]

[0093] Table 2 Performance comparison between the RF cable of the present invention and the common RF cable after 10 bendings

[0094] Table 3 Performance comparison between the RF cable of the present invention and the common RF cable after 50 bendings

[0095]

[0096] Table 4 Performance comparison between the RF cable of the present invention and the common RF cable after 100 bendings

[0097]

[0098] The above Tables 1, 2, 3 and 4 show that the performance of the ultra-flexible, lightweight, high-power medical RF cable produced by the production method of the present invention is significantly better than that of ordinary RF cables. After being bent for different times, the performance of the RF cable of the present invention is reduced, but the reduction is significantly less than that of ordinary RF cables. Moreover, the overall performance is still significantly better than that of ordinary RF cables, and the weight of the RF cable of the present invention is lower than that of ordinary RF cables.

[0099] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A medical ultra-flexible, lightweight, high-power radio frequency cable, characterized in that: The radio frequency cable is composed of a cable core, an inner protective layer, a shielding layer and an outer protective layer from inside to outside; The cable core includes a plurality of twisted conductors, and the plurality of twisted conductors are connected by twisting; The inner protective layer is wrapped around the outer periphery of the cable core to isolate the current and reduce the torsional force of the cable core; the inner protective layer is made of a flexible material; The shielding layer is used to eliminate signal mutual interference, and includes a first shielding layer and a second shielding layer, wherein the first shielding layer is wrapped around the outer periphery of the inner protective layer, and the second shielding layer is wrapped around the outer periphery of the first shielding layer; wherein the first shielding layer is wrapped around the inner protective layer, and the wrapping bandwidth of the first shielding layer is determined by the minimum bending radius of the cable; The outer protective layer is coated on the outer periphery of the second shielding layer to protect the internal overall structure; the outer protective layer is made of a flexible material; The production method of the radio frequency cable comprises: Step S1, obtaining a twisted cable core, coating the outer periphery of the cable core with a first coating material to obtain an inner protective layer, and obtaining the thickness of the inner protective layer, the overall diameter of the cable core and the inner protective layer, the minimum bending radius of the cable, and the maximum bending radius of the cable; the first coating material is an extruded foamed PTFE medium; Step S2, determining the bandwidth of the second coating material according to the thickness of the inner protective layer, the overall diameter of the cable core and the inner protective layer, and the minimum bending radius of the cable, and using the corresponding bandwidth to wrap the second coating material around the outer periphery of the inner protective layer to obtain a first shielding layer; wherein the second coating material is a copper-plastic composite tape; Step S3, bending the cable after the second coating material covers the inner protective layer for a preset number of times to obtain a radial slip amount of the second coating material, and determining a fixing method of the first shielding layer according to the radial slip amount, including continuous fixing and intermittent fixing; Step S4, determining the diameter of the third coating material according to the outer diameter of the first shielding layer, the minimum bending radius of the cable and the standard bending frequency, and weaving and coating a plurality of the third coating materials on the outer periphery of the first shielding layer at a first braiding angle to obtain the second shielding layer; wherein the third coating material is tinned copper wire; Step S5, obtaining the maximum bending deformation of the second shielding layer, and determining the thickness of the outer protective layer according to the maximum bending deformation; Step S6, preparing the outer protective layer based on the thickness of the outer protective layer, and coating the outer protective layer on the outer periphery of the second shielding layer to complete the preparation of the radio frequency cable.

2. The ultra-flexible, lightweight, high-power radio frequency cable for medical use according to claim 1, characterized in that: The first shielding layer is a copper-plastic composite tape, the second shielding layer is a tinned copper wire braided structure, the inner protective layer is an extruded foamed PTFE medium, and the outer protective layer is an extruded foamed PTFE medium.

3. The ultra-flexible, lightweight, high-power radio frequency cable for medical use according to claim 2, characterized in that: In the step S2, determining the bandwidth of the second coating material includes: Step S21, determining the thickness of the second coating material according to the thickness of the inner protective layer and the overall diameter of the cable core and the inner protective layer; Step S22: determining the bandwidth of the second coating material according to the thickness of the second coating material and the minimum bending radius of the cable.

4. The ultra-flexible, lightweight, high-power radio frequency cable for medical use according to claim 3, characterized in that: In the step S3, the preset number of times is determined according to the minimum bending radius and the maximum bending radius of the cable.

5. The ultra-flexible, lightweight, high-power radio frequency cable for medical use according to claim 4, characterized in that: In the step S3, a fixing method of the first shielding layer is determined according to a relationship between the radial slip amount and a preset slip amount threshold.

6. The ultra-flexible, lightweight, high-power radio frequency cable for medical use according to claim 5, characterized in that: In step S3, if the radial slip is less than a preset slip threshold, the first shielding layer is fixed in an intermittent manner; if the radial slip is greater than or equal to the preset slip threshold, the first shielding layer is fixed in a continuous manner.

7. The ultra-flexible, lightweight, high-power radio frequency cable for medical use according to claim 6, characterized in that: In the step S4, determining the diameter of the third coating material includes: Step S41, determining a first curvature according to an outer diameter of the first shielding layer and a minimum bending radius of the cable; Step S42: determining the diameter of the third coating material according to the first curvature and the standard bending frequency.

8. The ultra-flexible, lightweight, high-power radio frequency cable for medical use according to claim 7, characterized in that: In the step S4, the first braiding angle is determined according to the thickness of the inner protective layer and the thickness of the first shielding layer.

9. The ultra-flexible, lightweight, high-power radio frequency cable for medical use according to claim 8, characterized in that: In the step S5, the maximum bending deformation amount and the standard bending deformation amount of the second shielding layer are compared, and the thickness of the outer protective layer is determined according to the comparison result.

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